COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 14, Problem 49QAP
To determine
The fraction of heat that is given off by
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Chapter 14 Solutions
COLLEGE PHYSICS
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- On a certain dry sunny day, a swimming pool 's temperature would rise by 1.50 if not for evaporation. What fraction of the water must evaporate to carry away precisely enough energy to keep the temperature constant?arrow_forwardAt our distance from the Sun, the intensity of solar radiation is 1 370 W/m2. The temperature of the Earth is affected by the greenhouse effect of the atmosphere. This phenomenon describes the effect of absorption of infrared light emitted by the surface so as to make the surface temperature of the Earth higher than if it were airless. For comparison, consider a spherical object of radius r with no atmosphere at the same distance from the Sun as the Earth. Assume its emissivity is the same for all kinds of electromagnetic waves and its temperature is uniform over its surface. (a) Explain why the projected area over which it absorbs sunlight is r2 and the surface area over which it radiates is 4r2. (b) Compute its steady-state temperature. Is it chilly?arrow_forwardThe formation of condensation on a glass of ice water causes the ice to melt faster than it would otherwise. If 6.30 g of condensation forms on a glass containing water and 180 g of ice, how many grams will melt as a result? Assume no other heat transfer occurs. Use the heat of vaporization of water at 37°, as an approximation, in this problem. _________garrow_forward
- Determine the heat transfer, in kJ/kg, for the reversible process 1-3 shown in Fig. P8–44.arrow_forwardTwo finned surfaces are identical, except that the convection heat transfer coefficient of one of them is twice that of the other. For which finned surface is the (a) fin effectiveness and (b) fin efficiency higher? Explain.arrow_forwardQ25 2) A spherical infrared heater of radius 5.8 cm and an emissivity of 0.79 radiates 0.56 kW of power. Given, Stefan's constant =5.67x10^-8 Wm^-²K^-4 . Calculate, Temperature of the heater in Celsius:arrow_forward
- Can the thermal resistance concept be used for a solid cylinder or sphere in steady operation? Explain.arrow_forward(II) When a diver jumps into the ocean, water leaks into the gap region between the diver’s skin and her wetsuit, forming a water layer about 0.5 mm thick. Assuming the total surface area of the wetsuit covering the diver is about 1.0m2 and that ocean water enters the suit at 10°C and iswarmed by the diver to skin temperature of 35°C, estimate how much energy (in units of candy bars = 300 kcal ) is required by this heating process.arrow_forwardWhile painting the top of an antenna 225m in height, you accidentally let a1.00-L water bottle fall from your lunchbox. The bottle lands in some bushes at ground level and does not break. If a quantity of heat equal to the magnitude of the change in mechanical energy of the water goes into the water, what is the increase in temperature?arrow_forward
- Can the temperature of the cold fluid rise above the inlet temperature of the hot fluid at any location in a heat exchanger? Explain.arrow_forwardA small spinning asteroid is in a circular orbit around a star, much like the earth's motion around our sun. The asteroid has a surface area of 8.00 m2. The total power it absorbs from the star is 4500 W. Assuming the surface is an ideal absorber and radiator, calculate the equilibrium temperature of the asteroid (in K).arrow_forwardEstimate the work that must be done to double the volume of a spherical bubble (treated as a spherical cavity) of air of initial radius 5.0 mm in water at 298 K. The surface tension of water at th is temperature is 72 mN m-1.arrow_forward
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